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Old 10-20-2012, 01:35 PM
Huskymaniac's Avatar
Huskymaniac Huskymaniac is offline
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Join Date: Jul 2010
Location: Corning, NY
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SSM values versus OBD2 values for fuel trim

Has anyone ever compared them? I'm not entirely sure how their related. OBD2 reports long term and short term fuel trim for each bank. My car has always shown one bank as being high but I get about 29 MPG on the highway. The SSM shows one number per bank and I have seen it referred to as alpha ane air/fuel correction. These numbers seem pretty close to zero on both banks for my 1996. Seems odd that they differ so much. Another funky thing about the high bank on OBD2 is that the long term number will be high with the A/C on but the short term will be high if the A/C is off.
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Tony

1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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